The DualHead2Go DP Edition from Matrox is an external
device that lets you drive dual displays, each at up to 1920 x 1200
resolution, from a single DisplayPort output. This allows you to drive
dual digital or analog displays from a laptop, or from a desktop that
only has one DisplayPort connection. The device is compatible with Mac,
Windows, and Linux systems.

Enables a dual monitor setup for your notebook or desktop computer

Supports a maximum resolution of 3840 x 1200 (2x 1920 x 1200) --
displays attached to DualHead2Go must run at the same resolution